GB1378251A - Root-mean-square converter - Google Patents

Root-mean-square converter

Info

Publication number
GB1378251A
GB1378251A GB136272A GB136272A GB1378251A GB 1378251 A GB1378251 A GB 1378251A GB 136272 A GB136272 A GB 136272A GB 136272 A GB136272 A GB 136272A GB 1378251 A GB1378251 A GB 1378251A
Authority
GB
United Kingdom
Prior art keywords
signal
input
output
root
mean
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB136272A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weston Instruments Inc
Original Assignee
Weston Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weston Instruments Inc filed Critical Weston Instruments Inc
Publication of GB1378251A publication Critical patent/GB1378251A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/20—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating powers, roots, polynomes, mean square values, standard deviation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/02—Measuring effective values, i.e. root-mean-square values

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Networks Using Active Elements (AREA)

Abstract

1378251 Measuring r.m.s. values WESTON INSTRUMENTS Inc 12 Jan 1972 [15 Jan 1971] 1362/72 Heading G1U The r.m.s. value of an input signal I, applied to a'terminal 22, is evaluated by an automatic balancing loop in which the difference I-If, where If is a feedback signal, and the sum I + If, are applied respectively from two summing junctions 28, 30 via amplifiers 18, 20, to the two inputs 21, 23 of a multiplier 12, and the output of the multiplier, which will equal I<SP>2</SP> - If<SP>2</SP>, is integrated 14, to produce the feedback signal If, which signal is also available as an output signal on a terminal 56. In the equilibrium condition, the output of the integrator will be static and therefore the integral of the input then applied to it will be zero. That is, (I<SP>2</SP>-If<SP>2</SP>) dt=0, and therefore, since If is constant, If is the r.m.s. value of the input I. (For Figure see next page)
GB136272A 1971-01-15 1972-01-12 Root-mean-square converter Expired GB1378251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10674171A 1971-01-15 1971-01-15

Publications (1)

Publication Number Publication Date
GB1378251A true GB1378251A (en) 1974-12-27

Family

ID=22313003

Family Applications (1)

Application Number Title Priority Date Filing Date
GB136272A Expired GB1378251A (en) 1971-01-15 1972-01-12 Root-mean-square converter

Country Status (4)

Country Link
CA (1) CA953421A (en)
DE (1) DE2165486A1 (en)
FR (1) FR2121692B1 (en)
GB (1) GB1378251A (en)

Also Published As

Publication number Publication date
CA953421A (en) 1974-08-20
FR2121692B1 (en) 1976-06-11
FR2121692A1 (en) 1972-08-25
DE2165486A1 (en) 1972-07-27

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees